Fountain pen



FIG. 1 is a top left perspective view of a fountain pen embodying our new design;

FIG. 2 is a top left perspective view of the fountain pen of FIG. 1 with the pen cap shown on the end opposite the writing end of the pen;

FIG. 3 is a left side elevational view of the fountain pen of FIG. 1;

FIG. 4 is a front elevational view of the fountain pen of FIG. 1;

FIG. 5 is a rear elevational view of the fountain pen of FIG. 1;

FIG. 6 is a top plan view of the fountain pen of FIG. 1; and,

FIG. 7 is a bottom plan view of the fountain pen of FIG. 1. 

We claim the ornamental design for a fountain pen, as shown and described. 